---Please come here again.-----I will surely you when I come to your city someday.A. drop

问题补充：

---Please come here again.

-----I will surely you when I come to your city someday.

A. drop in at

B. drop in

C. drop on

D. drop in on

答案：

A. drop in at

B. drop in

C. drop on

(答案→)D. drop in on

解析：drop in on +人意为：顺便走访某人； drop in at+地方意思是：顺便走访某地方。